Tag: SDR

Malahit DSP2 – Firmware History

Malahit DSP2 – Firmware download

I have received permission from Georgiy to upload the firmware to my server. You can download it here:

Malahit DSP2 – Firmware – Changelog

Here you can find the changelog: Changelog (Перечень изменений) – Google Docs

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.07.24

  • fixed battery voltage indication
  • fixed behavior of encoder buttons at low supply voltage
  • protection against false switching has been made – for switching on by three, set switch 2 to the On position.
  • added test function – increased display frequency. This reduces noise and increases the number of frames per second; To enable this function, set switch 3 to On. The function may not work correctly, if so, please let me know
  • the level of interference from the display is slightly reduced
  • changed the distribution of frequencies to which the input high-pass filters are turned on
  • when HiZ is turned on, the power supply of the external active antenna is automatically turned off;
  • added indication of external antenna power on – now the ANT indicator is highlighted in red if this function is enabled
  • the algorithm for displaying the picture on the display, slightly reduces the level of interference
  • changed the panorama display mode from “Pan & WTF Disabled / Enabled” to “Pan & WTF Single / Always”, while the panorama image is now always present, but it is updated once (when the settings are changed) or always.
  • fixed attenuators bugs

Malahit DSP2 – Firmware Changelog – Test 2.10 SAM 2021.07.31

  • SAM functionality

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.13

  • corrected voltmeter operation
  • added SAMU, SAML modes
  • increased interface display frequency
  • improved switching between menus – now it does not pause
  • optimized the WFM algorithm, the receiver began to work faster
  • improvements made to Pan & WTF Single mode
  • removed graphical artifact near the SQL indicator

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.16

  • improved suppression of interference from the display. Now in SSB, AM, NFM modes, noise reduction is automatically turned on. This slows down the speed of the user interface, but greatly reduces the clutter! This function is not used in WFM mode.

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.17

  • Waterfall bandwith increased from 160khz to 192khz

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.25

  • added Pseudo Stereo function. Added Pseudo Stereo button to Audio menu
  • added the ability to switch audio output in the HARD menu – added the Audio out button. Ph + Sp – headphones and speaker, Phone – headphones, Speaker – speaker
  • added PGA BST function to HARD menu. This function can be useful when receiving strong signals and receiving congestion. When overloading, you must select the Disabled position.
  • changed the arrangement in the frequency bar under the spectrum
  • changed the behavior of the receiver with a short press on the power button. Now, with a short press in the receiver, the touchscreen is turned off, the spectrum and waterfall work similarly to the Pan & WTF Single option.
  • the lower operating frequency has been reduced from 50 kHz to 20 kHz.

Malahit DSP2 – Firmware Changelog – 2.10D 2021.08.26

Alle changes between 2.0 and all test version to 2.10D are included:

  • fixed battery voltage indication
  • fixed behavior of encoder buttons at low supply voltage
  • protection against false switching has been made – for switching on by three, set switch 2 to the On position.
  • added test function – increased display frequency. This reduces noise and increases the number of frames per second; To enable this function, set switch 3 to On. The function may not work correctly, if so, please let me know
  • the level of interference from the display is slightly reduced
  • changed the distribution of frequencies to which the input high-pass filters are turned on
  • when HiZ is turned on, the power supply of the external active antenna is automatically turned off;
  • added indication of external antenna power on – now the ANT indicator is highlighted in red if this function is enabled
  • the algorithm for displaying the picture on the display, slightly reduces the level of interference
  • changed the panorama display mode from “Pan & WTF Disabled / Enabled” to “Pan & WTF Single / Always”, while the panorama image is now always present, but it is updated once (when the settings are changed) or always.
  • fixed attenuators bugs
  • corrected voltmeter operation
  • added SAMU, SAML modes
  • increased interface display frequency
  • improved switching between menus – now it does not pause
  • optimized the WFM algorithm, the receiver began to work faster
  • improvements made to Pan & WTF Single mode
  • removed graphical artifact near the SQL indicator
  • correction of S meter was introduced depending on the range. Now the S meter is accurate enough
  • improved suppression of interference from the display. Now in SSB, AM, NFM modes, noise reduction is automatically turned on. This slows down the speed of the user interface, but greatly reduces the clutter! This function is not used in WFM mode.
  • added Pseudo Stereo function. Added Pseudo Stereo button to Audio menu
  • added the ability to switch audio output in the HARD menu – added the Audio out button. Ph + Sp – headphones and speaker, Phone – headphones, Speaker – speaker
  • added PGA BST function to HARD menu. This function can be useful when receiving strong signals and receiving congestion. When overloading, you must select the Disabled position.
  • changed the arrangement in the frequency bar under the spectrum
  • the lower operating frequency has been reduced from 50 kHz to 10 kHz.
  • span increased to 192 kHz.
  • changed properties of USB audio devices – now IQ 192kHz, simple audio – 48kHz.

Malahit DSP2 – Firmware Changelog – Test 2.10E 2021.10.08

  • Fixed the scale with the image often – the scale is made in the color of the panorama, added horizontal lines
  • Improved retro-scale – brought to v1.10C
  • EMI reductuin function added: decreased noise by changing display frequency
  • fixed moving from AUDIO menu to other menus – now without delay
  • Gradual volume increase on power on
  • Improved dead band 380-403,3MHz
  • Changes The encoders work differently – now you can use the audio encoder independently. The settings are changed with the frequency encoder
  • Sleep time option was removed from Visual menu
  • added color scheme for waterfall – now there are three modes of work – classic, black-white and white-black

Malahit DSP2 – Firmware 2.10D – New options

You can activate two experimantal fuctions, which less interferences fro the TFT, more FPS on the screen and a new power on mode.

  • Switch 2: The receiver power on with 3 pushes on the power button (for me it takes 5 pushes), without only one push is needed
  • Switch 3: Added in test firmware from 2021.07.24, but don´t need to be activated in the last firmware from 2021.08.16, because it´s default activated

Malahit DSP2 – CAT control and waterfall to a PC

When you connect the Malahit DSP2 to a Windows 10 computer, you can control it and see a waterfall on it. There are many tools on Windows 10, which are supporting the sound input from the Malahit DSP2.

Tools with sound input and CAT control (Windows 10):

  • SDRUno
  • HDSDR
  • SDR#

Features which are possible:

  • Waterfall
  • Sync frequency and some settings from the Malahit DSP2 to the PC
  • Sync frequency and some settings from the PC to the Malahit DSP2

In this blog post, i show you SDRUno with OmniRig.

Malahit DSP2 – Driver

For me it wasn´t necessary to install any driver. Windows 10 found the driver by itself. In the Device Manager it should look like this:

Malahit DSP2 – Sound control pannel

Open the Windows 10 sound control panel and then the record tab and activate Malahit spectre – Malahit IQ:

Malahit DSP2 – OmniRig 1.19

At first you must install OmniRig 1.19. With the 2.1 version i had problems. The installation is easy, so i don´t make screenshots from it.

Now you can start OmniRig and configure it like this:

  • Tab: RIG1 (or if you have other receivers connected, pelase note the rig number for SDRUno setup later)
  • Rig type: 480-TS
  • One of the com ports in your device manager (for me it was the second one COM4)

If you make change in OmniRig, SDRUno must be shutdown. If not, it don´t get the new configuration.

Malahit DSP2 – SDRUno

The Installtion is very easy. You can find it here:

Now please start the SDRUno (EXTIO) version, because only in this version, you can change to a audio source:

Now click on the SETT. button:

Now change to the input device of the Malahit DSP2. If you don´t know which of them is the correct, test both:

Click on the RX button on the left side and than on the SETT. button, from the new window:

On the new settings windows click on the tav ORIG and than click on RIG1 and activate all checkboxes:

At last click on the RSYN1 button:

Now you can start the receiving with a click on the PLAY! button:

At the end it should look like this. You can add the two waterfall windows with SP1 / SP2 buttons:

W-FM receiving example

If you now change the frequency or the mode in SDRUno, the Malahit DSP2 should get this change.

Please note: It can take some moment for the synchronisation.

Malahit DSP2 – Reset to default configuration

You can reset the Malahit DSP2 to the default configuration:

  • User configuration will be lost
  • Frequency favorites and band menu will be lost
  • Dynamic Retro Scale custom settings will be lost

To reset the Malahit DSP2 you have to do this:

  • Exit all menus
  • Hold down both encoder buttons until you can hear a beep sound

Now the default configuration should be loaded.

Malahit DSP2 – Waterfall bandwith

On the Malahit DSP2 the waterfall has 3 bandwith options:

  • 160 kHz
  • 80 kHz
  • 40 kHz

To change the waterfall bandwith, tap on the selected area:

Now the waterfall bandwith changes from 160 kHz to 80 kHz.

If you tap another time on the selected area, the waterfall bandwith changes to 40 kHz:

If you tap a last time on the area, the 160 kHz waterfall bandwith came back.

Malahit DSP2 – Set clock

You can set the system clock of the Malahit DSP2. Tap some time on the HARD menu button, until it beeps:

Now you should see this configuration screen:

  • with the small encoder button you can scroll in the selected option
  • click short on the small encoder button, to change the item

You can save the selected time:

  • push the small encoder button until it beeps, now the new time is saved

Malahit DSP2 – HARD menu

The Malahit DSP2 offers very much options for configuration. Today we look at the HARD menu:

Hard menu options:

  • ENC reverse: Change direction for decoder buttons 1, 2 or both buttons
  • PWR ANT: Bias Tee voltage for a antenna or pre amp can be activated. Voltage is always the cell voltage from about 3,7v – 2,5v
  • Vbat control: Configuration for the cell voltage, with “Low”, the receiver don´t have a protection for undervolting. Use better “Standard”. With “Standard” the receiver shutdown under 3,3v.
  • SW antenna: 50 Ohm for a standard antenna, Hi Z for SW with a antenna like a telescopic one
  • PREAMP: Enable or Disable PreAmp. ith the PreAmp you can make the signals stronger
  • ATT: Attenuator, more dB the signal is weaker. It can help for strong signals
  • RF GAIN: With this option you can change the gain of the receiver, higher number for a stronger signal. To much gain is not good for the signals, because the signal are to strong
  • LNA/MIX UPGR: Gain reduction, if you enable this, the gain is weaker, responsible for enabling or disabling gain reduction
  • MIX GR: Gain reduction, if you enable this, the gain is weaker, responsible for enabling or disabling gain reduction
  • F correct: If you have a frequency shift, you can controll it with this function
  • Sm correct: You can control the sensitivy of the S Meter
  • BEEP LVL: Level of the beep sound of the controls
  • Ind type: Change from SNR to dBm. “Signal to noise ratio” is an indicator of the signal quality. dBm is a indicator how strong is the signal
  • Activity timer: The Malahit DSP2 shutdown after the time is configured
  • Pre Gain: You can control the gain of the PreAmp, lower number for a stronger signal (0 is the strongest). To much gain is not good for the signal

Malahit DSP2 – Dynamic Retro Scale

The Dynamic Retro Scale of the Malahit SDR is a very nice feature and it can be activated:

  • Change the frequency to to W-FM range of your region
  • Change the mode to W-FM

Now you shuld see the Dynamic Retro Scale windows. If you see the waterfall or the RDS data screen, touch on it (for the RDS data screen, the part on the bottom, which is marked on the picture below), until you see the correct screen.

Malahit DSP2 – Dynamic Retro Scale – Region

At first you must set your region, because both regions have diffrent ranges. Click on the “VISUAL” menu and set the option “Retro Scale”:

  • European (87,5-108 MHz)
  • Japanese (75,1-94,9 MHz)

Dynamic Retro – Hidden configuration menu

You can access the hidden menu, if you touch on the space which i marked on the picture:

Dynamic Retro Scale – Configuration menu

In the configuration menu you can find manyoptions:

  • Auto search for all stations in your near (maximum number of stations is 69)
  • Add / Edit Station (Add new stations and edit stations added or found with auto search, seven characters, numbers, Latin, Cyrillic)
  • Rename of the scale (change the name of the scale)
  • Clear scale (delete scale)
  • Change to another scale (switch to another scale)
  • Load a preset (presets which created by the autor)
  • Change the color (green, yellow or white scale)

Dynamic Retro Scale – Auto Search

With the “Auto Search” you can search for all stations which you can receive. The Dynamic Retro Scales can show the stations after the auto search. If the search found a station, it shows the message “PILOT-TONE DETECTED”. There is a limit of 69 stations. The search process is looking like this and takes about 5 minutes:

After the search is finished, you can see all stations the search has found and you can save the result as a new scale:

After the scan is saved, it´s look like this:

Problems with auto search

If you find too much or too less stations and “WMF Stereo” is enabled, try to activate the headphone. Perhaps it can also help to connect a headphone to the audio out socket. WMF Stereo can only work with a headphone, because without the pilot tone can´t be determined.

Thanks to Peter!

Dynamic Retro Scale – Change Color

Here can you change the color of the Dynamic Retro Scale:

  • Yellow
  • Green
  • White

Dynamic Retro Scale – Add / Edit stations

Here you can:

  • delete stations
  • add new stations
  • rename stations

Possible are seven characters, numbers, Latin, Cyrillic:

The arrows on the screen allow you to change the station name. Above the arrows there is a double window, on the left is the frequency of the station, on the right is the name. By default, after auto search or manual search, the name matches the frequency. Pressing the right arrow will not be able to change the frequency, but you can change the station name.

Dynamic Retro Scale – Rename Scale

Here you can rename the name of your scales. Possible are seven characters, numbers, Latin, Cyrillic:

Dynamic Retro Scale – Clear Scale

Here you can delete the scale you want:

Dynamic Retro Scale – Load Preset

Here can you load a preset from stations from some locations:

Dynamic Retro Scale – Switch Scale

Here can you switch through your scales:

Malahit DSP2 – Firmware update

At first: You can´t do any permanent damage to the Malahit DSP2. If the firmware updates fails, the Malahit DSP2 remains in the DFU mode an can be flashed again.

Malahit DSP2 – Firmware Download

I have received permission from Georgiy to upload the firmware to my server. You can download it here:

You can found the chagelog on the bottom of this page.

Malahit DSP2 – Firmware Update – DFU mode

At first you must start the Malahit DSP2 in DFU Mode:

  1. Push the two encoder buttons at the same time and hold until step 4.
  2. Push the power button
  3. Release the two encoder buttons
  4. Release the power button
  5. If the LED of the Malahit DSP is blinking green and red, it is in DFU mode

If it don´t work, do it faster. If it is to slow, it don´t work.

Now the Malahit DSP2 should be in the DFU mode. You can plug in the USB cable to Malahit DSP2 and computer. If you open the device manager in Windows 10, you should see this:

Please note: You need a USB cable with data cables. A USB cable only for charging isn´t working.

Malahit DSP2 – Firmware Update – STM32CubeProgrammer

Now you must start the tool STM32CubeProgrammer. If you don´t have installed it, you can find it here:

Malahit DSP2 – Firmware Update – STM32CubeProgrammer – Windows 11

I tried to start the STM32CubeProgrammer x64 in Windows 11 and i got this error:

You have to start the STM32CubeProgrammer on Windows 11 as Admin, than it´s starts without error:

Malahit DSP2 – Firmware Update – STM32CubeProgrammer – Connect Malahit DSP2

In the STM32CubeProgrammer you have to set the dropdown list to USB. Than you have to click on the refresh button right from the “Port USB1

Than you have to click on the button “Connect“:

Now it should look like this:

Malahit DSP2 -Firmware Update – STM32CubeProgrammer – Flash firmware

Now you have to click on the “Erasing and Programming” button:

Now you can select the firmware file do you want to upgrade (you find all possible versions on the top of the page, extract the downloaded file first) and select the checkboxes “Verfify programming” and “Run after programming“. The firmware file can be a hex or a bin file, both file types are working.

At the end you must press the button “Start Programming“.

If you get this error, try to flash the same firmware file a second time. Perhaps you have to reconect the Malahit DSP2 to the computer to do it. Keep calm, the device remains in the DFU mode.

This image has an empty alt attribute; its file name is image-35.png

Malahit DSP2 – Firmware – Changelog

Here you can find the changelog: Changelog (Перечень изменений) – Google Docs

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.07.24

  • fixed battery voltage indication
  • fixed behavior of encoder buttons at low supply voltage
  • protection against false switching has been made – for switching on by three, set switch 2 to the On position.
  • added test function – increased display frequency. This reduces noise and increases the number of frames per second; To enable this function, set switch 3 to On. The function may not work correctly, if so, please let me know
  • the level of interference from the display is slightly reduced
  • changed the distribution of frequencies to which the input high-pass filters are turned on
  • when HiZ is turned on, the power supply of the external active antenna is automatically turned off;
  • added indication of external antenna power on – now the ANT indicator is highlighted in red if this function is enabled
  • the algorithm for displaying the picture on the display, slightly reduces the level of interference
  • changed the panorama display mode from “Pan & WTF Disabled / Enabled” to “Pan & WTF Single / Always”, while the panorama image is now always present, but it is updated once (when the settings are changed) or always.
  • fixed attenuators bugs

Malahit DSP2 – Firmware Changelog – Test 2.10 SAM 2021.07.31

  • SAM functionality

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.13

  • corrected voltmeter operation
  • added SAMU, SAML modes
  • increased interface display frequency
  • improved switching between menus – now it does not pause
  • optimized the WFM algorithm, the receiver began to work faster
  • improvements made to Pan & WTF Single mode
  • removed graphical artifact near the SQL indicator

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.16

  • improved suppression of interference from the display. Now in SSB, AM, NFM modes, noise reduction is automatically turned on. This slows down the speed of the user interface, but greatly reduces the clutter! This function is not used in WFM mode.

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.17

  • Waterfall bandwith increased from 160khz to 192khz

Malahit DSP2 – Firmware Changelog – Test 2.10 2021.08.25

  • added Pseudo Stereo function. Added Pseudo Stereo button to Audio menu
  • added the ability to switch audio output in the HARD menu – added the Audio out button. Ph + Sp – headphones and speaker, Phone – headphones, Speaker – speaker
  • added PGA BST function to HARD menu. This function can be useful when receiving strong signals and receiving congestion. When overloading, you must select the Disabled position.
  • changed the arrangement in the frequency bar under the spectrum
  • changed the behavior of the receiver with a short press on the power button. Now, with a short press in the receiver, the touchscreen is turned off, the spectrum and waterfall work similarly to the Pan & WTF Single option.
  • the lower operating frequency has been reduced from 50 kHz to 20 kHz.

Malahit DSP2 – Firmware Changelog – 2.10D 2021.08.26

Alle changes between 2.0 and all test version to 2.10D are included:

  • fixed battery voltage indication
  • fixed behavior of encoder buttons at low supply voltage
  • protection against false switching has been made – for switching on by three, set switch 2 to the On position.
  • added test function – increased display frequency. This reduces noise and increases the number of frames per second; To enable this function, set switch 3 to On. The function may not work correctly, if so, please let me know
  • the level of interference from the display is slightly reduced
  • changed the distribution of frequencies to which the input high-pass filters are turned on
  • when HiZ is turned on, the power supply of the external active antenna is automatically turned off;
  • added indication of external antenna power on – now the ANT indicator is highlighted in red if this function is enabled
  • the algorithm for displaying the picture on the display, slightly reduces the level of interference
  • changed the panorama display mode from “Pan & WTF Disabled / Enabled” to “Pan & WTF Single / Always”, while the panorama image is now always present, but it is updated once (when the settings are changed) or always.
  • fixed attenuators bugs
  • corrected voltmeter operation
  • added SAMU, SAML modes
  • increased interface display frequency
  • improved switching between menus – now it does not pause
  • optimized the WFM algorithm, the receiver began to work faster
  • improvements made to Pan & WTF Single mode
  • removed graphical artifact near the SQL indicator
  • correction of S meter was introduced depending on the range. Now the S meter is accurate enough
  • improved suppression of interference from the display. Now in SSB, AM, NFM modes, noise reduction is automatically turned on. This slows down the speed of the user interface, but greatly reduces the clutter! This function is not used in WFM mode.
  • added Pseudo Stereo function. Added Pseudo Stereo button to Audio menu
  • added the ability to switch audio output in the HARD menu – added the Audio out button. Ph + Sp – headphones and speaker, Phone – headphones, Speaker – speaker
  • added PGA BST function to HARD menu. This function can be useful when receiving strong signals and receiving congestion. When overloading, you must select the Disabled position.
  • changed the arrangement in the frequency bar under the spectrum
  • the lower operating frequency has been reduced from 50 kHz to 10 kHz.
  • span increased to 192 kHz.
  • changed properties of USB audio devices – now IQ 192kHz, simple audio – 48kHz.

Malahit DSP2 – Firmware Changelog – Test 2.10E 2021.10.08

  • Fixed the scale with the image often – the scale is made in the color of the panorama, added horizontal lines
  • Improved retro-scale – brought to v1.10C
  • EMI reductuin function added: decreased noise by changing display frequency
  • fixed moving from AUDIO menu to other menus – now without delay
  • Gradual volume increase on power on
  • Improved dead band 380-403,3MHz
  • Changes The encoders work differently – now you can use the audio encoder independently. The settings are changed with the frequency encoder
  • Sleep time option was removed from Visual menu
  • added color scheme for waterfall – now there are three modes of work – classic, black-white and white-black

Malahit DSP2 – Firmware 2.10D – New options

You can activate two experimantal fuctions, which less interferences fro the TFT, more FPS on the screen and a new power on mode.

  • Switch 2: The receiver power on with 3 pushes on the power button (for me it takes 5 pushes), without only one push is needed
  • Switch 3: Added in test firmware from 2021.07.24, but don´t need to be activated in the last firmware from 2021.08.16, because it´s default activated

SAR32M – Portable antenna from Greece

The radio amateur SV2CZF makes some very interesting antennas and sells them on his website for a small fee: https://www.sv2czf.com

For a long time I had been tempted by the MWA30 (https://www.sv2czf.com/mwa30.html), which is a very small portable mini-whip that runs on battery power. Unfortunately, mini-whips must be well grounded, so I decided to use his latest antenna, the SAR32M. This one works even without good grounding and you can connect an antenna via a whip antenna like a telescopic or a loop.

Features

  • Reception from 50 KHz to 175 MHz
  • Built-in rechargeable battery which can be charged via Micro USB port (approx. 10 hours battery power)
  • A normal whip antenna, like a telescopic antenna, can be connected
  • A loop can be connected
  • A loop and a telescopic antenna can be connected in parallel
  • Impedance adjustment for shortwave
  • Built-in Pre Amp for amplification
  • Only suitable for receiving, when transmitting the SAR32M will be damaged directly

How to order

The SARM32M is already shown on the homepage, but cannot be ordered through it yet.

  • Write a e mail in english to this adress: info@sv2czf.com
  • By default, the SARM32M is delivered with BNC connectors. But you can also ask SV2CZF to install SMA connectors
  • Antenna 94,99 € and shipping 6,99 €. The antenna is shipped in a bubble envelope and passed customs without any problems for me
  • The shipping took for me from Greece to Germany only 5 days.

Experience in practice

I use the SAR32M mainly with my Malahit DSP2. Here, the SMA32M with the same 70 cm telescopic antenna, depending on the frequency range, can get out again about the 3 S-stages (for example, in the 40 m band). Unfortunately, the reception breaks in from about 50 MHz, so that e.g. 2 m works better without the SAR32M in between.

On the other hand, if you connect a loop, the SAR32M shows its potential. You can compare it well with the MLA 30 +, which also provides very good reception results. The loop made of wire, which is supplied with the MLA 30 +, also fits optimally to the SAR32M. However, any piece of wire or cable can also be used.

The battery life is about 3 times longer than the Malahits DSP2 with a 3400 mah cell. The great thing is that this makes the SAR32M perfect for portable use.

Here are two examples on the 40m band, received with the SARM32M and a 70 cm telescopic antenna. First CW:

Again with SSB with only a 70 cm telescopic antenna:

The performance is very very good.

From inside

On Facebook I found the following picture of the inside view. The legs are firmly glued and usually break off when you try to open the lid (yes, I tried 😉 )

Malahit DPS2 – SDR Receiver from Russia

The Malahit DSP2 can be purchased directly from the developers in Russia. Since about May 2021, the version Malahit DSP2 is now sold.

Procedure of purchase:

  • Contact Georgiy per e mail in english: malahit_sdr@rambler.ru
  • Get on the waiting list and wait 😉
  • As soon as the Malahit DSP2 is ready, you will receive an email from Georgiy
  • Now you have to send the money via Paypal (via friends / family) to Georgiy
  • 19,500 rubles with shipping and 21,500 rubles with expess shipping

I was on the waiting list for about a month and the shipping with express, then took another 5 business days to Germany.

Features of the Malahit DSP2

  • Reception from 50 kHz to 380 MHz and from 400 MHz to 2 GHz
  • Modulations AM, CW, LSB, USB, DSB, FM, W-FM with CW decoder
  • The optional board is integrated, which you had to buy with the DSP1.
  • Hi Z and Pre Amp, which makes it possible to receive on shortwave even with a normal telescopic antenna of e.g. 70 cm (see videos)
  • Waterfall bandwith between 40 khz, 80 khz and 160 khz (in newer firmware 48 khz, 96 khz and 192 khz)
  • W-FM for radio reception with RDS support and stereo
  • Dynamic Retro Scale for W-FM visualisation
  • Extremely good noise blocker
  • Very good firmware support, there are many new firmware versions the last weeks

Additional Informations

Of course I tested the Malahit with the SAR32M antenna / 70cm telescopic antenna directly on the balcony and was positively surprised what I can receive everything, with a simple 70 cm telescopic antenna.

Here I show you the reception with a 70 cm telescopic antenna, which is adjusted with Hi Z and amplified with the Pre Amp of the Malahit. The reception is really amazingly good!

Here you can see the SSB reception with the SAR32M and a 70 cm telescopic antenna. In the 40 m band, the SAR32M, provides about 2-3 S-stages better reception. Amazing is also the extremely good noise blocker.

2 x 18650 mod

First I tested if the Malahit DSP2 can also be converted to two 18650 cells and it is possible. But on some boards standing capacitors were installed. Here you have to make sure that you push the speaker to the edge to create space to the left.

In addition, a small and deep 2 x 18650 holder should be used, as can also be seen in the picture. Here you have to be careful to shorten the soldering lugs to the housing.

BMS proctection for the 18650 cell and the Malahit DSP2

The Malahit DSP2 has no protection functions, like a BMS but it´s using the TP5056 charging controller. The charging controller has some protections functions while and after charging.

I added a cheap BMS to be safe, that my 18650 cell have a long life and is protected against a short circuit or things like this.

Bias Tee function, e.g. to supply an external Pre Amp

Then I tested the Bias Tee option and found that always the battery voltage is output. So from 4V – 3,3V (if the VBAT Standard options is activated). This could be problematic, because the cell voltage is to low for most devices.

SMA connector

Please note: The SMA socket problems are solved, because the developers are using a new SMA socket.

The only problems I had were related to the SMA connector: The included SMA telescope antenna had a too thick inner conductor and then apparently broke the SMA connector.

I then installed a U.FL to SMA adapter, which I still had at home, in the Malahit DSP2 and since then everything is fine again. Strangely, I had to try several of these adapters, until then one worked. With the others I only had reception when I connected the respective antenna to the SMA connector.

The U.FL to SMA cable used by the developers is extremely short and was installed in a sharp bend. So all the time there was a lot of voltage on the U.FL connector. As you can see on the picture, I used an adapter with longer RG316 cable. I also secured the cable to the relay with a small blob of hot glue to prevent the port from being live.

Better buttons

Nikolay makes very good and high quality knobs, e.g. for the Malahit DSP1 / DSP2. With shipping both knobs cost 13 € and can be ordered from him by e-mail: nickstrannik@gmail.com

More informations you can get here: http://mini-whip.de/2021/08/11/malahit-dsp-better-buttons/

Malahit DSP1 / Malahit DSP2 holder

Serhii is making a very nice holder for all orginal Malahits. More Informations you can get here: http://mini-whip.de/2021/08/04/malahit-dsp2-holder-from-serhii/

Bluetooth Mod

Currently I am working on a Bluetooth mod: I will install a Bluetooth board in the housing of the Malahit DSP2, that I will solder to the 3.5 jack output. So I can then use a Bluetooth headphones or speakers, without an adapter to the 3.5 jack socket, to plug from the outside. I soldered together a small housing for the bluetooth board to avoid possible interference.

The board on the picture can work with the 18650 voltage from 3,0V to 5,5V. I can receive and sent sound, but for the Malahit, only the sending part in needed.

Problems with the Malahit DSP2

The software problems like a wrong voltage are already fixed in the new 2,10 test firmwares. The biggest hardware problem for me was the bad SMA socket, but this problem is also already fixed at newer Malahits DSP2.